I recently discovered the name of my GGG-grandfather as Bartholomew Breen. His son, Thomas Breen (and sometimes appeared as Brien in census and birth records)b. about 1826 - 1830 married Johanna Sullivan b. 1829 or 1830 on
26 June 1853 in Poplar, Middlesex Cnty, England. They are both from Cnty Cork, Ireland, according to family lore.
The marriage cert. lists Thomas' father as Bartholomew Breen (which explains why he named his only son Bartholo) and Johanna Sullivan's father as Daniel Sullivan. I cannot read the catholic parish where the wedding took place, so the names and the actual wedding date are all I netted from it. I'm still happy. :)
I'm posting in hopes of finding others researching these Breen/Briens. Also, if anyone is good at reading olde english handwriting and wants to try to read this parish from the marriage cert., I've attached a scan.